Mulitply. Simplify your answer when possible -3x(x^3 + 2x^2 -x)

Question

Mulitply. Simplify your answer when possible        -3x(x^3 + 2x^2 -x)

anonymous · Answer

I'm lost for some reason :(

whpalmer4 · Answer

Okay, just use the distributive property here.
$$a(b+c) = ab + ac$$

I'll solve a similar problem, so as not to give you the answer:

$$-2x(x^2 -x) = -2x*x^2 - 2x*(-x) = -2x^3 +2x^2$$

Note well that change of sign in the final term!  You have to be very careful when multiplying a negative something times something in parentheses — make sure you always apply the negative sign from the multiplier on the outside, and subtracting a negative number is the same as adding.

anonymous · Answer

ok thank you so so much I will study this for a bit to try and figure it out.